I've been looking over my research on this particular topic lately, after discovering my dress diary had outdated links (bad webmistress, no cookie), and I can't see where you get this particular information. It seems to me quite clear that the diagonal bits are the shoulder seams in shirt 1 in particular, and all the others as well.
If you look at the pamphlet published by the Royal Armoury, Bild 14 & 15 show close-ups of the shoulder seam and sleeve attachment of shirt 1, and all along the sleeve the grain of the fabric is parallell, while up into the shoulder seam the grain of the fabric comes in at a 45 degree angle. And in the pattern sketches, Bild 2 & 3 clearly label the top of the side seam O and E, which corresponds to the middle of either sleeve.
Do you have another source of information for this? If so I'd love to see it! More research-y goodness.
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If you look at the pamphlet published by the Royal Armoury, Bild 14 & 15 show close-ups of the shoulder seam and sleeve attachment of shirt 1, and all along the sleeve the grain of the fabric is parallell, while up into the shoulder seam the grain of the fabric comes in at a 45 degree angle. And in the pattern sketches, Bild 2 & 3 clearly label the top of the side seam O and E, which corresponds to the middle of either sleeve.
Do you have another source of information for this? If so I'd love to see it! More research-y goodness.